Phase relations in Mg3Al2Si3O12 to 180 GPa: Effect of Al on post-perovskite phase transition

Details Phase relations in Mg3Al2Si3O12 to 180 GPa: Effect of Al on post-perovskite phase transition Phase relations in Mg3Al2Si3O12 to 180 GPa: Effect of Al on post-perovskite phase transition

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3215306t&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 15, CiteID L15306

Physics

12

Geochemistry: Composition Of The Mantle, Geochemistry: Mineral And Crystal Chemistry (3620), Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineral Physics: High-Pressure Behavior, Mineral Physics: X-Ray, Neutron, And Electron Spectroscopy And Diffraction

Scientific paper

Phase relations in Mg3Al2Si3O12 (MgSiO3 + 25 mol% Al2O3; pyrope garnet composition) were investigated on the basis of in-situ synchrotron X-ray diffraction measurements at high-pressure and -temperature in a laser-heated diamond anvil cell (LHDAC). Results demonstrate that perovskite is solely stable up to 140 GPa and 2200 K, and perovskite and CaIrO3-type post-perovskite phase (space group: Cmcm) coexist above 140 GPa and 2200 K. Post-perovskite is formed as a single phase above 150-170 GPa. Previous study has shown that pure MgSiO3 perovskite transforms to post-perovskite phase above 125 GPa and 2500 K based on the same pressure standard. These results indicate that addition of Al2O3 expands the stability of MgSiO3 perovskite relative to post-perovskite.

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